fix(YAML): Enable YAML custom tags support (#3456991 by Grimreaper)

coder_sniffer/DrupalPractice/Project.php

@@ -190,7 +190,7 @@ class Project
             return false;
         }
 
-        $services = Yaml::parse(file_get_contents($ymlFile));
+        $services = Yaml::parse(file_get_contents($ymlFile), Yaml::PARSE_CUSTOM_TAGS);
         if (isset($services['services']) === false) {
             $cache[$phpcsFile->getFilename()] = false;
             return false;

tests/DrupalPractice/Objects/testmodule.services.yml

 services:
   testmodule.example:
     class: Drupal\testmodule\ExampleService
+
+  testmodule.test_tagged_iterator:
+    class: Drupal\testmodule\ExampleService
+    arguments:
+      - !tagged_iterator coder_test